Packing demonstration: Barbara DesChamps, author of "It's in the Bag: The Complete Guide to Lightweight Travel," will show how to pack more than 100 items in one lightweight carry-on. 12 noon Saturday at Borders Stonestown Galleria, San Francisco, (415) 731-0665; and 4 p.m. at Borders San Mateo, 2925 El Camino Real. (650) 286-1895. Free.